From patchwork Tue Mar 7 14:15:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 13163678 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8E8E4C678D5 for ; Tue, 7 Mar 2023 14:23:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231129AbjCGOXt (ORCPT ); Tue, 7 Mar 2023 09:23:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43252 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231436AbjCGOXT (ORCPT ); Tue, 7 Mar 2023 09:23:19 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DA3929EF5 for ; Tue, 7 Mar 2023 06:17:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1678198590; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=n3W1bhWob2cqsJzOEtepU6FLEJePtTlcXD6B2i+jL6E=; b=AnRWT8Y+aI9vksgR7u1U2Sb++E/cr6u9WcNra5wj4H3almvmr/jSZjraB4AaAzOufUUhL7 rcsw41SKn7XoONn8LtJ53dtiixNu9S5JDS3YOyxUfBG3auboISY2ZLnCRYJX47a/lbfXCM 5kgkfTZMcNB6sAOC7pLpHKiy2LMPOrI= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-504-QbMbx1ypNWernilKofLC1g-1; Tue, 07 Mar 2023 09:16:26 -0500 X-MC-Unique: QbMbx1ypNWernilKofLC1g-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 9E06A3C0E450; Tue, 7 Mar 2023 14:16:25 +0000 (UTC) Received: from localhost (ovpn-8-16.pek2.redhat.com [10.72.8.16]) by smtp.corp.redhat.com (Postfix) with ESMTP id DB236140EBF4; Tue, 7 Mar 2023 14:16:24 +0000 (UTC) From: Ming Lei To: Jens Axboe , io-uring@vger.kernel.org Cc: linux-block@vger.kernel.org, Miklos Szeredi , ZiyangZhang , Xiaoguang Wang , Bernd Schubert , Ming Lei Subject: [PATCH V2 14/17] block: ublk_drv: support to copy any part of request pages Date: Tue, 7 Mar 2023 22:15:17 +0800 Message-Id: <20230307141520.793891-15-ming.lei@redhat.com> In-Reply-To: <20230307141520.793891-1-ming.lei@redhat.com> References: <20230307141520.793891-1-ming.lei@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.7 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Add 'offset' to 'struct ublk_map_data', so that ublk_copy_user_pages() can be used to copy any sub-buffer(linear mapped) of the request. Signed-off-by: Ming Lei --- drivers/block/ublk_drv.c | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index ba252932951c..c0cb99cb0c3c 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -511,19 +511,37 @@ static void ublk_copy_io_pages(struct ublk_io_iter *data, } } +static bool ublk_advance_io_iter(struct ublk_io_iter *iter, unsigned int offset) +{ + struct bio *bio = iter->bio; + + for_each_bio(bio) { + if (bio->bi_iter.bi_size > offset) { + iter->bio = bio; + iter->iter = bio->bi_iter; + bio_advance_iter(iter->bio, &iter->iter, offset); + return true; + } + offset -= bio->bi_iter.bi_size; + } + return false; +} + /* * Copy data between request pages and io_iter, and 'offset' * is the start point of linear offset of request. */ static size_t ublk_copy_user_pages(const struct request *req, - struct iov_iter *uiter, int dir) + unsigned offset, struct iov_iter *uiter, int dir) { struct ublk_io_iter iter = { .bio = req->bio, - .iter = req->bio->bi_iter, }; size_t done = 0; + if (!ublk_advance_io_iter(&iter, offset)) + return 0; + while (iov_iter_count(uiter) && iter.bio) { unsigned nr_pages; size_t len, off; @@ -576,7 +594,7 @@ static int ublk_map_io(const struct ublk_queue *ubq, const struct request *req, import_single_range(dir, (void __user *)io->addr, rq_bytes, &iov, &iter); - return ublk_copy_user_pages(req, &iter, dir); + return ublk_copy_user_pages(req, 0, &iter, dir); } return rq_bytes; } @@ -596,7 +614,7 @@ static int ublk_unmap_io(const struct ublk_queue *ubq, import_single_range(dir, (void __user *)io->addr, io->res, &iov, &iter); - return ublk_copy_user_pages(req, &iter, dir); + return ublk_copy_user_pages(req, 0, &iter, dir); } return rq_bytes; }